[Bug 3971] Race condition when using ControlMaster=auto with simultaneous connections

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3971

Jens Rosenboom <jens.rosenboom at web.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #3967|0                           |1
        is obsolete|                            |

--- Comment #7 from Jens Rosenboom <jens.rosenboom at web.de> ---
Created attachment 3977
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3977&action=edit
Fix race condition

Fix race condition when using ControlMaster=auto with simultaneous
connections

Update after self-review:
- Added test for correct handling of a stale control socket
- Don't create new master control socket for any ControlCommands
("-O...")
- Check that control socket is removed after exit command

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